Utjecaj parametara izrade na svojstva polimernoga prototipa

doctoral thesis

• Title (english): Influence of processing parameters on the properties of polymer prototype
• Author: Ana Pilipović
• Mentor: Mladen Šercer (mentor)
• Committee member: Dorian Marjanović (predsjednik povjerenstva)
• Committee member: Mladen Šercer (član povjerenstva)
• Committee member: Đurđica Španiček (član povjerenstva)
• Committee member: Igor Drstvenšek (član povjerenstva); VIAF: 305525399
• Committee member: Pero Raos (član povjerenstva)
• Granter: University of Zagreb; Faculty of Mechanical Engineering and Naval Architecture; Zagreb
• Defense date and country: 2012-10-03, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Mechanical Engineering; Production Mechanical Engineering
• Universal decimal classification (UDC): 678 - Industries based on macromolecular materials. Rubber industry. Plastics industry

Abstract

Brza proizvodnja prototipova (e. Rapid Prototyping - RP) počela se razvijati početkom 1980 - tih godina i nije bila orijentirana na masovnu proizvodnju, već na potrebe i zahtjeve kupaca. Prema normi ASTM F42, 2009. godine primjenjuje se izraz aditivna proizvodnja (e. Additive Manufacturing - AM). To su postupci kojima je moguće izraditi relativno komplicirane geometrije na temelju računalnog 3D modela tvorevine u relativno kratkom vremenu. Pritom se zahtjeva da odgovarajuća tvorevina bude dobre kvalitete, dobrih mehaničkih svojstava, dimenzijske točnosti i preciznosti. \No broj raspoloživih materijala koje je moguće upotrijebiti za proizvodnju prototipova je ograničen i njihova svojstva se mogu dosta razlikovati od svojstava materijala konačne tvorevine. Stoga je za optimalnu primjenu prototipova pri razvoju tvorevine potrebno poznavati svojstva materijala prototipova, posebice ako se s pomoću njih provode funkcijska ispitivanja. U okviru doktorskog rada izrađena su ispitna tijela uz podešavanje različitih parametara (položaj ispitnog tijela u izradbenom prostoru stroja, brzina izrade, unešena energija tijekom izrade, debljina sloja materijala i snaga lasera). Zatim je analiziran izgled površine (hrapavost), mehanička svojstva dobivenih ispitnih tijela, te utjecaj atmosferilija (UV zračenja, upojnost vode) na njihova svojstva. Konačno, na temelju sistematiziranih podataka dobivenih ispitivanjem svojstava ispitaka, dan je kritički osvrt na podatke o svojstvima materijala koje navode njihovi proizvođači.

Abstract (english)

Rapid prototyping began to develop in early 1980 th and was not focused on mass production, but on demands and needs of customers. According to standard ASTM F42 from 2009., Additive Manufacturing – AM is applied. With AM it is possible to create physical models, prototypes, components, tools and functional parts from 3D data constructed using the computer (CAD), with complicated geometry in relatively short time, which is very difficult or even impossible to do with other manufacturing technologies. At the same time requirement is product of good quality, good mechanical properties, dimensional accuracy and precision. There are also many restrictions, primarily in the number of available materials and their properties which may differ quite considerably from the properties of the end-user products materials. Therefore, for optimal use of prototypes in product development it is necessary to know the material properties, and how the various parameters of the machine influence on them, especially if it is used on carry out functional tests. Within doctoral thesis adequate test specimens will be prepared and it will be tested how the machine parameters (orientation of test specimen, energy density, speed and power of laser, and layer thickness of materials) influence the roughness, mechanical properties of product and resistance to atmospheric conditions (UV radiation and absorption of water). Finally, based on the systematized data obtained by testing of properties of the test specimen, it will be provided a critical commentary regarding the data stipulated by their producers.

• Keywords: aditivni postupci; apsorpcija vode; dimenzijska točnost; hrapavost; masa; mehanička svojstva; parametri prerade; selektivno lasersko srašćivanje – SLS; starenje
• Keywords (english): ageing; additive manufacturing; dimensional accuracy; mass; mechanical properties; procesing parameters; roughness; selective laser sintering – SLS; water absorption
• Language: croatian
• URN:NBN: urn:nbn:hr:235:460411
• Study programme: Title: Mechanical Engineering and Naval Architecture; Study programme type: university; Study level: postgraduate; Academic / professional title: doktor/doktorica znanosti, područje tehničkih znanosti (doktor/doktorica znanosti, područje tehničkih znanosti)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2020-05-14 08:02:51